Mine-alarm instrument.



H. W. LEE & G. H. WEEDMAN. MINE ALARM INSTRUMENT. APPLICATION FILED PEBJI, 1911.

Patented Feb. 20,1812.

i Jle/z-r (ivory:

' "UNITED STATES PATENT oEEIoE.

HENRY WHITE LEE AND GEoEGE HENRY,WEEDMAN, or MOUNT MORGAN,

' QU ENsLA D', AUSTRALIA.

MINE-ALARM INsTEUMEN'r.

To all whom it may concern:

Be it known that we, HENRY WHITE LEE, electrician, and GEORGE HENRY WEEDMAN, electrical fitter, subjects of the King of Great Britain and Ireland, both residing at Mount Morgan, in the State of Queensland, Commonwealth of Australia, have invented new and useful Improvements in Mine- Alarm Instruments, of which the following is a specification.

. The object of this invention is to provide a speedy and efi'ective alarm to be actuated electrically or otherwise for'the purpose of, in case of ground falls, warning. miners who are in or upon the mine, or for like puroses.

By the'devices hereinafter described, the

' slightest movement in the ground can be immediately signaled by means such as alarm bells or electric lights or both in or to the various parts of the mine. In mines without electric apparatus the warning may be by mechanical devices such as bells and I where electricity is used the signaling by red or other lights as well'as bells or other modifications will be preferably adopted as being more effective.

The alarm instrument 1s constructed of a wire-clrcuit and several telescopic or slidably jointed pipes or members of size and description to suit open chambersor drives where there is any danger of a creep or movement of the roof. I

In the drawingswhich accompany and form part of this specification Figure 1 is a view of the alarm apparatus fitted in a drive of a mine; Fig. 2, an enlarged vertical .section of the apparatus showing the telescopic tube; Fig. 3, a vertical section' of the top terminal; Fig. 4, a plan of same; Fig. 5,

a vertical section of the bottom terminal;

Fig. 6, a plan of same.

A is the fork which abuts against the roof of the drive or chamber.

B is the upper pipe member to whichthe fork is attached. 0 is a second pipe mem-- ber. l

D is a slot formed in p pe G to receive pin E which is secured to pipe B.

F is a terminal bearing ring secured to pipe B.

G is a pipe 0. i

H. H are thumb screws for adjusting the terminal rings.

terminal bearing ring securedto Specification of'Letters Patent. Patented Feb. 20, 1912.. Application filed February 11, 1911. Serial No. 607,91

I is a spring attached to. the bottom of pipe B and J is a rest forthe same.

' K is a Wood tube in which the exterior of C'slidably fits and L a thumb screw for ad justing the height of pipe 0 in K.

A tripod stand is provided having the ring M in-which the pipe K slides, and N is athumb screw by which the position of K is adjusted higher or lower as desired."

0 is a switch for controlling the signal circuit and PP PP PP are wires leadingv to I electric lights and bells arranged in various parts of the mine.

In operation-the members are slidably adjusted and. secured by the thumbscrews so that the fork or any other suitable top por tion is sprung into or impinges against the roof-of the chamber or drive. Any movement of the ground overhead causes: the

fork or top to press the upper terminals into.v

or against the-lower terminals thusestablishing electric contact and causing signals to operate such as lamps to glow and bells to ring to warn the persons employed. Any

number of alarms may be connected together.

and in parallel if desired or they may be worked singly. A bell battery of two cells may be conveniently used being placed anywhere near the alarm and does not require much or any diflicult attention. The terminal rings are of wood to insulate them from the standard.

The upper members may be telescoped into bottom members and the tripod folded so that the Whole apparatus can be easily moved.

We claim 1. In a mine alarm instrument, a pair of rods, one of said rods being arranged to extend within the other, a spring for holding .With the opposite wall for supporting said outer ,member.

2. In a mine alarm instrument, a support in engagement with one of the mine walls, ahollow rod adjustably secured to said support, contact members adjustably secured to said hollow rod, a second rod arranged to enter said hollow rod, said second'rod being provided with means for engaging i the inner rod in an extended position, an

the other of the mine Walls, adjustable connames to this specification in the presence tacts carried by said second named rod arof two subscribing Witnesses.

ranged to engage the first named adjustable HENRY 'WHITE LEE.

contacts, and a spring within said hollow GEORGE HENRY WEEDMAN. 5 rod for holding said inner rod in engage- Witnesses:

ment With one of the Walls. ROBERT GAMBLE BROWN,

In testimony whereof, We have signed our WILLIAM CATHRO TAIT RUssELL. 

